Specifications for construction of roads and bridges in national forests and national parks, 1941. :
Federal Works Agency, Public Roads Administration.

APA Citation

United States. Bureau of Public Roads. (1941). Specifications for construction of roads and bridges in national forests and national parks, 1941.: Federal Works Agency, Public Roads Administration. Washington: U.S. Govt. Print. Off.

MLA Citation

United States. Bureau of Public Roads. Specifications for Construction of Roads And Bridges In National Forests And National Parks, 1941.: Federal Works Agency, Public Roads Administration. Washington: U.S. Govt. Print. Off, 1941.